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| author | Michael Niedermayer <michaelni@gmx.at> | 2013-01-21 14:16:34 +0100 |
|---|---|---|
| committer | Michael Niedermayer <michaelni@gmx.at> | 2013-01-21 14:22:04 +0100 |
| commit | fbdb0313f53f84f5a8a5a23ad1880bf7ef4dcc5f (patch) | |
| tree | 6eafc2fe2ebf013164ad384945383954e9c2bf7e /libavcodec | |
| parent | 144529e09493fa5e395eabb8a214e6aec1cfc166 (diff) | |
| download | ffmpeg-fbdb0313f53f84f5a8a5a23ad1880bf7ef4dcc5f.tar.gz | |
ac3dec: fix non-optimal dithering of zero bit mantissas
Use a noise range of -0.707 to 0.707 instead of -0.5 to 0.5
Based on patch by: Mathias Rauen <madshi@gmail.com> and commit by Justin Ruggles (04ea5491)
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
Diffstat (limited to 'libavcodec')
| -rw-r--r-- | libavcodec/ac3dec.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/libavcodec/ac3dec.c b/libavcodec/ac3dec.c index 0d1c710eca..ee8b9701b1 100644 --- a/libavcodec/ac3dec.c +++ b/libavcodec/ac3dec.c @@ -443,7 +443,7 @@ static void ac3_decode_transform_coeffs_ch(AC3DecodeContext *s, int ch_index, ma switch (bap) { case 0: if (dither) - mantissa = (av_lfg_get(&s->dith_state) & 0x7FFFFF) - 0x400000; + mantissa = (((av_lfg_get(&s->dith_state)>>8)*181)>>8) - 5931008; else mantissa = 0; break; |